Can some one explain this to me. My first DL50 has a lot of compression and runs great, my second one has very little compression with at most two gallons through it. Since it was pretty windy today, I decided to adjust the mixture screws since it's now on synthetic oil. Before making any adjustments, I thought it would be smart to check rpms and was much surprised. 7350rpm, ProZinger 22x8, Jtek wrap around muffler, Florida, 70 degrees. I haven't checked the first DL50 recently, but it was in that range. I left the HS needle alone and leaned the LS needle just a bit. Anyway, why the good performance with low compression? To quantify the low compression, the prop can be turned with one finger.